A pyroclastic flow deposit from the 1929 eruption of Komagatake volcano, on the northern Japanese island of Hokkaido, overlies a brown pre-eruption surface. The upper part of the deposit contains large pumice that lacks fine-grained material between the clasts and the underlying unit is enriched in fine-grained material. A geological hammer provides scale.

Photo by Shinji Takarada, 1992 (Geological Survey of Japan).

This image is made available under the Creative Commons BY-NC-ND 4.0 license terms.

Galleries: Pyroclastic Flows

Keywords: pumice | deposit | pyroclastic flow | pyroclastic density current (PDC)

Hokkaido-Komagatake